Which sentence in a 5-paragraph essay interests the reader in the topic? a. lead-in b. thesis c. topic d. transition

The Thesis.

Hope this helped.

The answer is A: The lead in because that's basically like the first few sentences. That's when you introduce them to the topic. Your not going to introduce them in the middle, your going to introduce them when they start reading. Hope that helps :)
        ~Spades15